Abstract
Objectives: The aim of this paper is to develop an indoor wireless infrared CDMA system based on Zero Cross Correlation (ZCC) code to minimize the effect of noises, and thus improves the overall performance. Methods/ analysis: Two different configurations of 1-cell and 4-cell are investigated. A mathematical framework to calculate the SNR and the BER under the effect of total noise such as LED shot noise, ambient light shot noise and thermal noise, is derived. The system performance is analysed in terms of SNR and BER, versus the width and length of the room, and number of users, respectively, and then compared with the system based on a Flexible Cross Correlation (FCC) code. Findings: The indoor infrared CDMA based on 4-cell configuration using the ZCC code showed better performance than the system based on 1-cell configuration or using the FCC code. As results, the 4-cell configuration based on ZCC could accommodate a larger number of users rate at the corners and edges of the room. It offered 42% and 150% larger cardinality at the edges, and the corners of the room respectively, compared to the 1-cell configuration. In addition, this system also offered 55%, 47%, 51% larger cardinality at the centre, the edges, and the corners of the room, respectively, in contrast to the FCC code. Application/Improvement: The proposed 4-cell configuration based on ZCC code for indoor wireless infrared CDMA system enhances the cardinality, and offers an excellent degree of mobility.
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